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Ch.8 - Basic Concepts of Chemical Bonding
Brown - Chemistry: The Central Science 15th Edition
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Tutti i libri di testoBrown 15th EditionCh.8 - Basic Concepts of Chemical BondingProblema 24b
Capitolo 8, Problema 24b

NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions. (b) Use the ionic radii given in Figure 7.8 to estimate the Na─Cl and K─F distances.

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Identify the ionic radii for Na^+ and Cl^- from Figure 7.8.
Identify the ionic radii for K^+ and F^- from Figure 7.8.
Add the ionic radius of Na^+ to the ionic radius of Cl^- to estimate the Na─Cl distance.
Add the ionic radius of K^+ to the ionic radius of F^- to estimate the K─F distance.
Compare the estimated distances to understand the difference in separation between the cations and anions in NaCl and KF.

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Ionic Radii

Ionic radii refer to the effective size of an ion in a crystal lattice, which is influenced by its charge and the surrounding ions. Cations are typically smaller than their neutral atoms due to the loss of electrons, while anions are larger due to the gain of electrons. Understanding ionic radii is crucial for estimating distances between ions in ionic compounds.
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Ranking Ionic Radii

Crystal Structure

Crystal structure describes the orderly arrangement of ions in a solid, which determines the properties of the material. In the case of NaCl and KF, both adopt a face-centered cubic lattice structure, where each ion is surrounded by six oppositely charged ions. This arrangement is essential for understanding how ionic distances are calculated based on the positions of cations and anions.
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Ionic Bonding

Ionic bonding occurs when electrons are transferred from one atom to another, resulting in the formation of positively charged cations and negatively charged anions. The electrostatic attraction between these oppositely charged ions leads to the formation of ionic compounds like NaCl and KF. This concept is fundamental for understanding the interactions that dictate the distances between ions in a crystal lattice.
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Domanda del libro di testo

NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions. (a) The lattice energies of NaCl and KF are given in Table 8.1. Based on the lattice energies, would you expect the Na─Cl or the K─F distance to be longer?

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Domanda del libro di testo

(b) Write the chemical equation that represents the process of lattice energy for the case of NaCl.

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Domanda del libro di testo

(c) Would you expect salts like NaCl, which have singly charged ions, to have larger or smaller lattice energies compared to salts like CaO which are composed of doubly-charged ions?

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Domanda del libro di testo

The substances NaF and CaO are isoelectronic (have the same number of valence electrons). (b) What are the charges of each of the anions in each compound?

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Domanda del libro di testo

The substances NaF and CaO are isoelectronic (have the same number of valence electrons). (d) Using the lattice energies in Table 8.1, predict the lattice energy of ScN.

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Domanda del libro di testo

The substances NaF and CaO are isoelectronic (have the same number of valence electrons). (a) What are the charges on each of the cations in each compound?

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